Here is the
initial article I wrote up using the ninjaflx and the 3d2prints TPE filaments. After a bit more tweeking i ran a guide tube with a "notch" cut out eventually as occasionally the set up in the article when either loading or unloading would pull the tube into the gear drive with a tube with just a notch cut out where the drive gear was I haven't had that issue. I'm using a heavily modified Replicator 2x(which i hate) currently and occasionally a rostockmaxv2 (currently clogged with zenworks wood filament. :(
Now its just a matter of cutting down on the stringing and occasionally feed/melting rate (having some issues with ninjaflex green going really slow and yellow too when extruded at 225c) I think i also need a direct fan on the hotend.

the bear in the middle is polymakr's transparent blue PLA (the red is 3d2prints TPE Rubber, and the blue is Ninjaflex!)